Single Supply Amp help - LM3886?

[GePeW]

Hi, first of all i want to tell you that i just became a member and this is my first thread.Also my english are not so good so i'm sorry if i make a few spelling mistakes along.

I would like a little help about supplies and also i have some questions about the Gainclone amps.

First of all my intension is to build an chip amplifier and the motive is that i have lots of parts laying around.The thing is that the might be wrong for amp-use bacause the transformers that i have are single supply (i have 6 torodials 24V 200VA).I think there are good for +32V dc 6amps.I have almost all parts nedded for a chip amp except the chip (big capacitors,bridges,LM's for regulating the voltage,heatsinks...) but
the problem is a cannot find a decent chematic for single supply voltage (only the one on National LM3886 datasheet).

My questions :
-Why i cannot use a low-voltage,high current supply for an amp?
-Can i convert single to split supply(have a circuit that uses L165 and gives about 3 amps max,i will attach it)?
-In the National single supply circuit, do you use only "half" of the chip?

Again i'm sorry for any spelling mistakes.
Thanks in advance

[pinkmouse]

If you really want to to go with a single rail, the datasheet circuit is as good as any. However, you could combine two of your traffos in series to get 24-0-24. If you search, there are plenty of threads here explaining how to do it.

[GePeW]

You can combine two 0-24 transformers to get a 24-0-24? A have searched a lot on the internet and my highschool basic electronics books but i did not find anything, thanks for the info, i will search again.somewhere i read that the circuits from the datasheets are horrible to hear, there are only an example to show how the IC work.Have you ever build one?does it sound any good?I'm not try to build a high-end, but i want it at least to be a Hi-Fi!
thanks

[GePeW]

I just spend some time searching for what you said,but i did not find anything, itried different keywords and all but nothing.I only found a way to connect the primary in series,when i should be connecting the secontary, right? but from the things i read , i think there would be a ploblem with the phase of the AC.

What if i connect the primaries in parraler, and the secontaries in series?

If anyone has a circuit on how to convert single to split supply, could you please post it
Thanks

[pinkmouse]

Here's a pic, just ignore the centre taps shown on it and it will work fine.

[Nico Ras]

Here is Pink Mouse suggestion, it will work great.

[Nico Ras]

Alternative

[GePeW]

Also why the .22Ohm are 10W??? in case of short-circuit in the supply line? I assume that there will be a fuse before the primaries.

[GePeW]

Nico Ras the circuits are the same!maybe you mixxed the files,or there is somethings wrong with my explorer,the pics are 100% same.
Thank for the help,and also sorry for my late responce,i am a new member and the posts take time to appear.

[GePeW]

OK, now i see the second circuit.
In the first one, you used the positive side of the signal in one bridge, and the negative side in the other bridge to get the +-
In the second, you drive the positives and the negatives to the bridge and let the diodes within to sort it out (if i got it right).
What is the difference?what about the current?is it more on the first circuit (it looks better than the second).

If i use two 24V AC / 6amps transformers, will I get +33 6amps and -33 6amps , or half of the current for each?